<!DOCTYPE html />
<html>
  <head>
    <title>Hello World</title>
    <script src="./js/index.js"></script>
  </head>
  <body>
    <h1>Hello World!</h1>
    <img src="R-C.jpg" style="width: 200px;height: 100px"/>
    <form action="/query" method="POST" >
      <div>
        用户名：<input type="text" name="username" value="admin"  maxlength="10">
      </div>
      <div>
        密码：<input type="password" name="password" value="123456"  maxlength="10">
      </div>
      <input type="submit" value="提交">  
    </form>
    <button id="button" style="margin-bottom: 30px;">发送post</button><br />
    <input type="file" id="file" name="file"/>
    <button id="uploadfile">上传文件</button><br />

    <button id="sendjson">发送JSON</button>
  </body>
</html>